When you wear a personal flotation device (PFD aka life vest) because you have been consuming alcoholicbeverages and want to float in a body of water without drowning.
Corking, or "to cork", is when you place an object e.g. Fist, toy, thumb etc, into a man or women's anus. They then excrete said object back out, along with any other matter, that is packed inside.
Guy one: hey you two were making alot of noise last night Guy two: yeah sorry we were trying to cork each other
Guy one: get out, I will not have corking in my house!